Sure, here's an example of a simple tower defense game implemented as a single HTML file using JavaScript and smartphone-compatible pictograms:
To play the game, save the code in an HTML file, make sure to have "emozi_all/play.png" and "emozi_all/enemy.png" images in the same directory as the HTML file, and open the HTML file in any web browser on your smartphone. You can drag and drop towers by touching the screen at the desired locations and try to survive as long as possible by defending your castle from the continuously spawning enemies.